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In most nightclub environments, dark wool, cotton or synthetic slacks mate well with a button up shirt. Gentlemen in nightclubs should use caution to distinguish between button-up shirts appropriate for nightclub wear and the dressier, somewhat stodgier button-up shirts intended for professional office wear.
But it is always better to have jacket with you in case you see that other men wearing it. Make sure that your cocktail attire is accessorized with a good leather belt and well-polished shoes. In cocktail attire dress code wearing sneakers, athletic socks, jeans or shorts is strictly forbidden.